Wells Fargo recently (couple months ago) had mailserver issues where they failed to realize they had actually delivered the email. They sent me about 20 copies

Wells Fargo recently (couple months ago) had mailserver issues where they failed to realize they had actually delivered the email. They sent me about 20 copies of each email, then after a week sent an notice how they cannot send me an email . Even though they’ve got their 250 proper from my MTA. But they had fixed it since then, now emails work fine. I suspect they had some bug on their side, because I haven’t seen anything suspicious on mine (and nothing had changed on my side). Idk what was that.